
classDiagram
    class Main {
        +main() void
    }
    class DBConnector {
        -connection_params: dict
        +connect() Connection
        +get_field_type(table_name: str, field_name: str) str
    }
    class PinyinConverter {
        +convert_to_pinyin(text: str) str
    }
    class Utils {
        +parse_command_line_args() dict
    }
    Main --> DBConnector
    Main --> PinyinConverter
    Main --> Utils
